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Once a DIMENSIONAL GROUP has been defined, additional units beyond the base unit can be defined by adding a CONVERSION as a Child. Each CONVERSION defines a new ‘Unit’ and the method for converting from the BASE UNIT to the new Unit.

There are two methods available for performing the conversion:

  • Set Factor: to a number to multiply the BASE UNIT by
  • Set expressions for Base to Unit: and Unit to Base: parameters

The main example for the second method is temperature conversions. Let’s look at converting from F back to K.

The expressions to use are as follows:

  • Base to Unit: (1.8*value) - 459.67
  • Unit to Base: (value+459.67)/1.8

In the first expression, the special object reference ‘value’ refers to the Base unit (K), while in the second expression, ‘value’ refers to the Unit (F).

Essential Parameters:
Unit:Name of new UNIT
Optional Parameters:
Base to Unit:Expression using 'value' to represent BASE UNIT that converts from BASE UNIT to new UNIT.
Unit to Base:Expression using 'value' to represent new UNIT that converts from new UNIT back to BASE UNIT.
Factor:Factor to multiply BASE UNIT by to convert to UNIT